diff --git a/modules/directory/README.md b/modules/directory/README.md
index 86953a4..8603d9f 100644
--- a/modules/directory/README.md
+++ b/modules/directory/README.md
@@ -17,6 +17,13 @@ Sets directory options and defines directory aliases.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:directory:alias' skip 'yes'
+```
+
 - `d` prints the contents of the directory stack.
 - `1 ... 9` changes the directory to the **n** previous one.
 
diff --git a/modules/emacs/README.md b/modules/emacs/README.md
index f93304a..8cf7bfc 100644
--- a/modules/emacs/README.md
+++ b/modules/emacs/README.md
@@ -12,6 +12,13 @@ execution of `carton`.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:emacs:alias' skip 'yes'
+```
+
 ### Carton
 
 - `cai` installs dependencies.
diff --git a/modules/fasd/README.md b/modules/fasd/README.md
index 1958a73..04f9693 100644
--- a/modules/fasd/README.md
+++ b/modules/fasd/README.md
@@ -19,6 +19,13 @@ instead of the bundled version.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:fasd:alias' skip 'yes'
+```
+
 - `j` changes the current working directory interactively.
 
 ## Completion
diff --git a/modules/gnu-utility/init.zsh b/modules/gnu-utility/init.zsh
index a8521f0..2cfbf2f 100644
--- a/modules/gnu-utility/init.zsh
+++ b/modules/gnu-utility/init.zsh
@@ -44,8 +44,7 @@ _gnu_utility_cmds=(
   'libtool' 'libtoolize'
 
   # Miscellaneous
-  'awk' 'egrep' 'fgrep' 'getopt' 'grep' 'indent' 'make' 'sed' 'tar' 'time'
-  'units' 'which'
+  'awk' 'getopt' 'grep' 'indent' 'make' 'sed' 'tar' 'time' 'units' 'which'
 )
 
 # Wrap GNU utilities in functions.
diff --git a/modules/history/README.md b/modules/history/README.md
index 11c6d94..51e6e8c 100644
--- a/modules/history/README.md
+++ b/modules/history/README.md
@@ -36,6 +36,13 @@ Alternately, you can set `HISTFILE` manually to _`${ZDOTDIR:-$HOME}/.zhistory`_.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:history:alias' skip 'yes'
+```
+
 - `history-stat` lists the ten most used commands
 
 ## Settings
diff --git a/modules/history/init.zsh b/modules/history/init.zsh
index 3ef52ea..069dc2f 100644
--- a/modules/history/init.zsh
+++ b/modules/history/init.zsh
@@ -10,29 +10,28 @@
 # Options
 #
 
-setopt BANG_HIST                 # Treat the '!' character specially during expansion.
-setopt EXTENDED_HISTORY          # Write the history file in the ':start:elapsed;command' format.
-setopt SHARE_HISTORY             # Share history between all sessions.
-setopt HIST_EXPIRE_DUPS_FIRST    # Expire a duplicate event first when trimming history.
-setopt HIST_IGNORE_DUPS          # Do not record an event that was just recorded again.
-setopt HIST_IGNORE_ALL_DUPS      # Delete an old recorded event if a new event is a duplicate.
-setopt HIST_FIND_NO_DUPS         # Do not display a previously found event.
-setopt HIST_IGNORE_SPACE         # Do not record an event starting with a space.
-setopt HIST_SAVE_NO_DUPS         # Do not write a duplicate event to the history file.
-setopt HIST_VERIFY               # Do not execute immediately upon history expansion.
-setopt HIST_BEEP                 # Beep when accessing non-existent history.
+setopt BANG_HIST              # Treat the '!' character specially during expansion.
+setopt EXTENDED_HISTORY       # Write the history file in the ':start:elapsed;command' format.
+setopt SHARE_HISTORY          # Share history between all sessions.
+setopt HIST_EXPIRE_DUPS_FIRST # Expire a duplicate event first when trimming history.
+setopt HIST_IGNORE_DUPS       # Do not record an event that was just recorded again.
+setopt HIST_IGNORE_ALL_DUPS   # Delete an old recorded event if a new event is a duplicate.
+setopt HIST_FIND_NO_DUPS      # Do not display a previously found event.
+setopt HIST_IGNORE_SPACE      # Do not record an event starting with a space.
+setopt HIST_SAVE_NO_DUPS      # Do not write a duplicate event to the history file.
+setopt HIST_VERIFY            # Do not execute immediately upon history expansion.
+setopt HIST_BEEP              # Beep when accessing non-existent history.
 
 #
 # Variables
 #
 
-zstyle -s ':prezto:module:history' histfile '_pmh_histfile' || _pmh_histfile="${HISTFILE:-${ZDOTDIR:-$HOME}/.zsh_history}"
-zstyle -s ':prezto:module:history' histsize '_pmh_histsize' || _pmh_histsize=10000
-zstyle -s ':prezto:module:history' savehist '_pmh_savehist' || _pmh_savehist=${_pmh_histsize}
-HISTFILE="${_pmh_histfile}"  # The path to the history file.
-HISTSIZE="${_pmh_histsize}"  # The maximum number of events to save in the internal history.
-SAVEHIST="${_pmh_savehist}"  # The maximum number of events to save in the history file.
-unset _pmh_{hist{file,size},savehist}
+zstyle -s ':prezto:module:history' histfile 'HISTFILE' \
+    || HISTFILE="${HISTFILE:-${ZDOTDIR:-$HOME}/.zsh_history}" # The path to the history file.
+zstyle -s ':prezto:module:history' histsize 'HISTSIZE' \
+    || HISTSIZE=10000                                         # The maximum number of events to save in the internal history.
+zstyle -s ':prezto:module:history' savehist 'SAVEHIST' \
+    || SAVEHIST=$HISTSIZE                                     # The maximum number of events to save in the history file.
 
 #
 # Aliases
@@ -42,28 +41,3 @@ if ! zstyle -t ':prezto:module:history:alias' skip; then
   # Lists the ten most used commands.
   alias history-stat="history 0 | awk '{print \$2}' | sort | uniq -c | sort -n -r | head"
 fi
-
-if [[ -s "${OLD_HISTFILE::=${HISTFILE:h}/.zhistory}" ]]; then
-
-  # New 'HISTFILE' doesn't exist yet, rename legacy one if available and notify.
-  if [[ ! -s "$HISTFILE" ]]; then
-    <<EON
-NOTICE: Default path of 'HISTFILE' has changed from '${OLD_HISTFILE/#$HOME/~}'
-        to '${HISTFILE/#$HOME/~}'.
-        Attempting to rename the existing 'HISTFILE' ...
-EON
-    command mv -v "$OLD_HISTFILE" "$HISTFILE"
-
-  # New 'HISTFILE' does exist and is older than legacy one, just warn.
-  elif [[ "$OLD_HISTFILE" -nt "$HISTFILE" ]]; then
-    <<EOW
-WARNING: Default path of 'HISTFILE' has changed from '${OLD_HISTFILE/#$HOME/~}'
-         to '${HISTFILE/#$HOME/~}'.
-         Either set 'HISTFILE' in '${${0:h}/#$HOME/~}'
-         or move previous history from '${OLD_HISTFILE/#$HOME/~}' to
-         '${HISTFILE/#$HOME/~}'.
-EOW
-  fi
-
-  unset OLD_HISTFILE
-fi
diff --git a/modules/homebrew/README.md b/modules/homebrew/README.md
index 1875e08..77d8f37 100644
--- a/modules/homebrew/README.md
+++ b/modules/homebrew/README.md
@@ -12,6 +12,13 @@ brew shellenv
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:homebrew:alias' skip 'yes'
+```
+
 ### Homebrew Core
 
 - `brewc` cleans outdated brews and their cached archives.
diff --git a/modules/macports/README.md b/modules/macports/README.md
index ba6143b..15963b3 100644
--- a/modules/macports/README.md
+++ b/modules/macports/README.md
@@ -4,6 +4,13 @@ Defines MacPorts aliases and adds MacPorts directories to path variables.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:macports:alias' skip 'yes'
+```
+
 - `portc` cleans the files used to build ports.
 - `porti` installs a port.
 - `ports` searches for a port.
diff --git a/modules/node/README.md b/modules/node/README.md
index 6ec0b75..bc26215 100644
--- a/modules/node/README.md
+++ b/modules/node/README.md
@@ -29,6 +29,13 @@ _`$XDG_CONFIG_HOME/nvm`_, _`~/.nvm`_, or is installed with homebrew.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:node:alias' skip 'yes'
+```
+
 ### npm
 
 - `npmi` install a package.
diff --git a/modules/perl/README.md b/modules/perl/README.md
index 772d068..dd59449 100644
--- a/modules/perl/README.md
+++ b/modules/perl/README.md
@@ -40,6 +40,13 @@ The subcommands of _plenv_ is similar with _rbenv_.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:perl:alias' skip 'yes'
+```
+
 ### General
 
 - `pl` is short for `perl`.
diff --git a/modules/prompt/external/async b/modules/prompt/external/async
index bbbc92b..a66d76f 160000
--- a/modules/prompt/external/async
+++ b/modules/prompt/external/async
@@ -1 +1 @@
-Subproject commit bbbc92bd01592513a6b7739a45b7911af18acaef
+Subproject commit a66d76f8404bd9e7a26037640e6c892cf5871ff4
diff --git a/modules/prompt/external/powerlevel10k b/modules/prompt/external/powerlevel10k
index a066b55..0af598c 160000
--- a/modules/prompt/external/powerlevel10k
+++ b/modules/prompt/external/powerlevel10k
@@ -1 +1 @@
-Subproject commit a066b55f855c8e488d3ea9e26e861bdd5ecd4fe8
+Subproject commit 0af598cbed78660066f8a8f4465844501ba5695b
diff --git a/modules/prompt/external/pure b/modules/prompt/external/pure
index 5b458ba..2f13dea 160000
--- a/modules/prompt/external/pure
+++ b/modules/prompt/external/pure
@@ -1 +1 @@
-Subproject commit 5b458ba5b75f49a8071d53c343f1a23631f7bced
+Subproject commit 2f13dea466466dde1ba844ba5211e7556f4ae2db
diff --git a/modules/prompt/init.zsh b/modules/prompt/init.zsh
index 3180883..37bff32 100644
--- a/modules/prompt/init.zsh
+++ b/modules/prompt/init.zsh
@@ -10,18 +10,8 @@ autoload -Uz promptinit && promptinit
 
 # Load the prompt theme.
 zstyle -a ':prezto:module:prompt' theme 'prompt_argv'
-if [[ "$TERM" == (dumb|linux|*bsd*) ]] || (( $#prompt_argv < 1 )); then
+if [[ $TERM == (dumb|linux|*bsd*) ]] || (( $#prompt_argv < 1 )); then
   prompt 'off'
-elif [[ "$prompt_argv[1]" == 'powerlevel9k' ]] ; then
-  <<EOW
-WARNING: Prezto does not support 'powerlevel9k' anymore as it has
-         been deprecated and is not supported by its author.
-         Consider migrating to 'powerlevel10k' instead by setting:
-         zstyle ':prezto:module:prompt' theme 'powerlevel10k'
-         in ${${ZDOTDIR:-$HOME}/#$HOME/~}/.zpreztorc.
-         Switching to prezto default prompt 'sorin'..."
-EOW
-  prompt 'sorin'
 else
   prompt "$prompt_argv[@]"
 fi
diff --git a/modules/python/README.md b/modules/python/README.md
index 1695fa0..2e3b2ee 100644
--- a/modules/python/README.md
+++ b/modules/python/README.md
@@ -124,6 +124,13 @@ zstyle ':prezto:module:python:virtualenv' initialize 'no'
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:python:alias' skip 'yes'
+```
+
 - `py` is short for `python`.
 - `py2` is short for `python2`.
 - `py3` is short for `python3`.
diff --git a/modules/python/functions/_pip b/modules/python/functions/_pip
deleted file mode 100644
index 4e0ffb8..0000000
--- a/modules/python/functions/_pip
+++ /dev/null
@@ -1,19 +0,0 @@
-#compdef -P pip[0-9.]#
-#autoload
-
-#
-# Pip completion, delegating to pip to do all the completion work.
-#
-# Authors:
-#   Indrajit Raychaudhuri <irc@indrajit.com>
-#
-
-if (( $+commands[$words[1]] )); then
-
-  function _pip_completion {
-    compadd -- $( COMP_WORDS="$words[*]" COMP_CWORD=$(( CURRENT - 1 )) \
-                  PIP_AUTO_COMPLETE=1 $words[1] 2>/dev/null )
-  }
-  _pip_completion "$@"
-
-fi
diff --git a/modules/python/init.zsh b/modules/python/init.zsh
index 02eb52d..ce2fc69 100644
--- a/modules/python/init.zsh
+++ b/modules/python/init.zsh
@@ -50,7 +50,7 @@ fi
 unset local_pyenv
 
 # Return if requirements are not found.
-if (( ! $#commands[(i)python[23]#] && ! $+functions[pyenv] && ! $+commands[conda] )); then
+if (( ! $+commands[(i)python[0-9.]#] && ! $+functions[pyenv] && ! $+commands[conda] )); then
   return 1
 fi
 
@@ -136,8 +136,8 @@ if (( $+VIRTUALENVWRAPPER_VIRTUALENV || $+commands[virtualenv] )) \
 
   if [[ $pyenv_virtualenvwrapper_plugin_found != "true" ]]; then
     # Fallback to standard 'virtualenvwrapper' if 'python' is available in '$path'.
-    if (( ! $+VIRTUALENVWRAPPER_PYTHON )) && (( $#commands[(i)python[23]#] )); then
-      VIRTUALENVWRAPPER_PYTHON=$commands[(i)python[23]#]
+    if (( ! $+VIRTUALENVWRAPPER_PYTHON )) && (( $+commands[(i)python[0-9.]#] )); then
+      VIRTUALENVWRAPPER_PYTHON=$commands[(i)python[0-9.]#]
     fi
 
     virtualenvwrapper_sources=(
diff --git a/modules/rails/README.md b/modules/rails/README.md
index 129627a..5e230e0 100644
--- a/modules/rails/README.md
+++ b/modules/rails/README.md
@@ -4,6 +4,13 @@ Defines [Ruby on Rails][1] aliases.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:rails:alias' skip 'yes'
+```
+
 - `ror` is short for `rails`.
 - `rorc` starts the Rails console.
 - `rordc` starts the Rails console connected to the database.
diff --git a/modules/ruby/README.md b/modules/ruby/README.md
index 97a09f0..fa3d106 100644
--- a/modules/ruby/README.md
+++ b/modules/ruby/README.md
@@ -54,6 +54,13 @@ dependencies, with [Bundler][5].
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:ruby:alias' skip 'yes'
+```
+
 ### General
 
 - `rb` is short for `ruby`.
diff --git a/modules/screen/README.md b/modules/screen/README.md
index a1775f7..b554951 100644
--- a/modules/screen/README.md
+++ b/modules/screen/README.md
@@ -24,6 +24,13 @@ zstyle ':prezto:module:screen:auto-start' remote 'yes'
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:screen:alias' skip 'yes'
+```
+
 - `scr` is short for `screen`.
 - `scrl` lists sessions/socket directory.
 - `scrn` starts a new session.
diff --git a/modules/tmux/README.md b/modules/tmux/README.md
index e7ae929..f6d375b 100644
--- a/modules/tmux/README.md
+++ b/modules/tmux/README.md
@@ -53,6 +53,13 @@ Read [iTerm2 and tmux Integration][7] for more information.
 
 ## Aliases
 
+Aliases are enabled by default. To disable them, add the following to
+_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
+
+```sh
+zstyle ':prezto:module:tmux:alias' skip 'yes'
+```
+
 - `tmuxa` attaches or switches to a tmux session.
 - `tmuxl` lists sessions managed by the tmux server.